Makes 5 cups
Prep: 5 minutes
Total: 45 minutes
3 1/2 pounds|1367 grams green tomatoes
2 jalapeños, stemmed and thinly sliced
1 ½ teaspoons kosher salt
3 cups|700 grams granulated sugar
Put the tomatoes, jalapeños, and ½ cup water in a large saucepan. Cook on medium-low heat, stirring frequently, until everything is very soft, about 30 minutes. Add the sugar, salt, and an additional ½ cup water. Transfer to a blender and purée, then place the jam back into the saucepan. Bring to a boil, then reduce the heat to maintain a simmer. Cook for 10 minutes, then remove from heat and jar it up.